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<title>Adopting Oxygen (4.7) mechanisms and APIs</title>
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<h1>Adopting Oxygen (4.7) mechanisms and APIs</h1>

<p>
  This section describes changes that are required if you are trying to change
  your 4.6 plug-in to adopt the 4.7 mechanisms and APIs.
</p>

<ol>
	<li><a href="#Lucene_Index">Pre-built Lucene indexes should be updated</a></li>
</ol>

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<h2>1. <a name="Lucene_Index">Pre-built Lucene indexes should be updated</a></h2>
<p><strong>What is affected:</strong> Clients supplying pre-built Lucene help indexes.
</p>
<p><strong>Description:</strong>
We have updated the Apache Lucene search engine to Lucene 6.1.0. This means that the indexes
built with 3.5.0 will not be readable anymore. See <a href="https://lucene.apache.org/core/old_versioned_docs/versions/6_1_0/changes/Changes.html">
Lucene Change Log</a> for details.
</p>
<p><strong>Action required:</strong>
Clients should:
</p>
<ul>
<li>Re-build their indexes with Lucene 6.1.0 and supply them as before</li>
</ul>

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